<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div ad="阿蛋">这是一个块</div>
</body>
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.6.3.js"></script>
<script>
    console.log($("div").attr("ad"));
    console.log($("div").prop("ad"));
    $("div").attr("ad", "这不是啊蛋")
    $("div").prop("ad", "这不是阿蛋")

    console.log($("div").prop("id"));
    $("div").prop("id","prop1")
</script>

</html>